Revert "HDFS-15977. Call explicit_bzero only if it is available. (apache#2914)"

This reverts commit a277946.

Author: harshith-212

hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/CMakeLists.txt

@@ -48,7 +48,6 @@ find_package(GSasl)
 find_package(Threads)
 
 include(CheckCXXSourceCompiles)
-include(CheckSymbolExists)
 
 # Check if thread_local is supported
 unset (THREAD_LOCAL_SUPPORTED CACHE)
@@ -142,11 +141,6 @@ else (NOT NO_SASL)
     message(STATUS "Compiling with NO SASL SUPPORT")
 endif (NOT NO_SASL)
 
-check_symbol_exists(explicit_bzero "string.h" HAVE_EXPLICIT_BZERO)
-if(HAVE_EXPLICIT_BZERO)
-    add_definitions(-DHAVE_EXPLICIT_BZERO)
-endif()
-
 add_definitions(-DASIO_STANDALONE -DASIO_CPP11_DATE_TIME)
 
 # Disable optimizations if compiling debug

hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/bindings/c/hdfs.cc

@@ -1402,11 +1402,7 @@ int hdfsGetBlockLocations(hdfsFS fs, const char *path, struct hdfsBlockLocations
     hdfsBlockLocations *locations = new struct hdfsBlockLocations();
     (*locations_out) = locations;
 
-#ifdef HAVE_EXPLICIT_BZERO
-    explicit_bzero(locations, sizeof(*locations));
-#else
     bzero(locations, sizeof(*locations));
-#endif
     locations->fileLength = ppLocations->getFileLength();
     locations->isLastBlockComplete = ppLocations->isLastBlockComplete();
     locations->isUnderConstruction = ppLocations->isUnderConstruction();

hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/tests/hdfs_ext_test.cc

@@ -475,11 +475,7 @@ TEST_F(HdfsExtTest, TestReadStats) {
   hdfsFile file = hdfsOpenFile(fs, path.c_str(), O_WRONLY, 0, 0, 0);
   EXPECT_NE(nullptr, file);
   void * buf = malloc(size);
-#ifdef HAVE_EXPLICIT_BZERO
-  explicit_bzero(buf, size);
-#else
   bzero(buf, size);
-#endif
   EXPECT_EQ(size, hdfsWrite(fs, file, buf, size));
   free(buf);
   EXPECT_EQ(0, hdfsCloseFile(fs, file));

hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/tests/hdfspp_mini_dfs.h

@@ -92,11 +92,7 @@ class HdfsHandle {
     hdfsFile file = hdfsOpenFile(*this, path.c_str(), O_WRONLY, 0, 0, 0);
     EXPECT_NE(nullptr, file);
     void * buf = malloc(size);
-#ifdef HAVE_EXPLICIT_BZERO
-    explicit_bzero(buf, size);
-#else
     bzero(buf, size);
-#endif
     EXPECT_EQ(1024, hdfsWrite(*this, file, buf, size));
     EXPECT_EQ(0, hdfsCloseFile(*this, file));
     free(buf);